将内容写入上传的文件

Question

我正在读取 xlsx 文件并想将其写入我的服务器。我正在获取文件名并将文件内容写入临时目录。

当我执行项目时。它在我的服务器上创建文件并在其中写入1kb 内容。但是当我打开它时，它说file format or file extention 无效。

@RequestMapping(value = "/uploadFile")
public String uploadFileHandler(@ModelAttribute UploadFile uploadFile,
        @RequestParam("filename") String name
      /*  @RequestParam("file") MultipartFile file*/) {

    if (!name.isEmpty()) {
        try {
            byte[] bytes = name.getBytes();

            // Creating the directory to store file
            String rootPath = System.getProperty("catalina.home");
            File dir = new File(rootPath + File.separator + "tmpFiles");
            if (!dir.exists())
                dir.mkdirs();

            // Create the file on server
            File serverFile = new File(dir.getAbsolutePath()
                    + File.separator + name);
            BufferedOutputStream stream = new BufferedOutputStream(
                    new FileOutputStream(serverFile));
            stream.write(bytes);
            stream.close();             

            return "You successfully uploaded file=" + name;
        } catch (Exception e) {
            return "You failed to upload " + name + " => " + e.getMessage();
        }
    } else {
        return "You failed to upload " + name
                + " because the file was empty.";
    }
}

jsp:

js:

function uploadTemplate()
    {
        var filename = document.getElementById("filename").value;
        document.uploadRequest.action = "uploadFile?filename="+filename;
        document.uploadRequest.submit();
    }

html:

<form:form action="" method="POST" modelAttribute="uploadFile" name="uploadRequest"  enctype="multipart/form-data">     
            <div align="center" style="margin-bottom: 10px;">
                <button onClick = "downloadTemplate()"  style="width:250px" type="submit" class="admin_search_btn"><spring:message code="lblDownloadXls"></spring:message></button>
            </div>
            <div align="center" style="margin-bottom: 10px;" >                  
                <form:input path="fileName" style="width:200px" id="filename" class="admin_search_btn" type="file" />
                 <div align="center" style="margin-bottom: 10px;" > 
                    <button onClick = "uploadTemplate()" type="submit" class="admin_search_btn"><spring:message code="lblSubmit"></spring:message></button>&nbsp;
                    <button  type="submit" class="admin_search_btn">Cancel</button>
                </div>          

            </div>                      
        </form:form>  

Answer 1

好的，既然我在一定程度上理解了你的问题，这是我的答案

您正在尝试将上传的文件 (uploadFile) 写入您的服务器，名称为 filename。

像这样改变你的。

 if (!name.isEmpty()) {
            try {


    **// Here read the content of uploadFile (not of the name)**
                byte[] bytes = name.getBytes();

                // Creating the directory to store file
                String rootPath = System.getProperty("catalina.home");
                File dir = new File(rootPath + File.separator + "tmpFiles");
                if (!dir.exists())
                    dir.mkdirs();

                // Create the file on server
                File serverFile = new File(dir.getAbsolutePath()
                        + File.separator + name);
                BufferedOutputStream stream = new BufferedOutputStream(
                        new FileOutputStream(serverFile));

**// Write the content of the uploadfile not the filename**
                stream.write(bytes);
                stream.close();             

                return "You successfully uploaded file=" + name;
            } catch (Exception e) {
                return "You failed to upload " + name + " => " + e.getMessage();
            }
        } else {
            return "You failed to upload " + name
                    + " because the file was empty.";
        }

Answer 2

尝试使用 Apache POI 库写入 xlsx。